In the modern power industry, a large amount of power equipment needs to be purchased every year for the construction of power grid projects. Due to the complicated construction of the power grid and the large number of materials and equipment required, it is difficult to manage the material contracts signed by many suppliers. Signing the efficiency and ensuring the progress and quality of the power grid construction project, the article puts forward the application of the blockchain technology in the management of the power industry material contract, the alliance chain established between the grid enterprise and the equipment supplier for signing the contract, and A practical Byzantine Fault Tolerance (PBFT) consensus mechanism based on improved Debt Proof of Entitlement (DPoS) is proposed. This mechanism combines the number of contract awards to dynamically authorize nodes and optimizes the selection strategy of proxy nodes. The electronic contract realized by blockchain technology not only has the security of traditional electronic contracts based on cryptographic algorithms, but also has multi-party cooperation, non-tampering and traceability of transparency and authenticity, so that the signing and follow-up of material contracts Management is more convenient and safe.